#include "utils/AES.h"


const unsigned char sbox[16][16] = {
    {0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b,
     0xfe, 0xd7, 0xab, 0x76},
    {0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf,
     0x9c, 0xa4, 0x72, 0xc0},
    {0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1,
     0x71, 0xd8, 0x31, 0x15},
    {0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2,
     0xeb, 0x27, 0xb2, 0x75},
    {0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3,
     0x29, 0xe3, 0x2f, 0x84},
    {0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39,
     0x4a, 0x4c, 0x58, 0xcf},
    {0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f,
     0x50, 0x3c, 0x9f, 0xa8},
    {0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21,
     0x10, 0xff, 0xf3, 0xd2},
    {0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d,
     0x64, 0x5d, 0x19, 0x73},
    {0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14,
     0xde, 0x5e, 0x0b, 0xdb},
    {0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62,
     0x91, 0x95, 0xe4, 0x79},
    {0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea,
     0x65, 0x7a, 0xae, 0x08},
    {0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f,
     0x4b, 0xbd, 0x8b, 0x8a},
    {0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9,
     0x86, 0xc1, 0x1d, 0x9e},
    {0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9,
     0xce, 0x55, 0x28, 0xdf},
    {0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f,
     0xb0, 0x54, 0xbb, 0x16}};

const unsigned char inv_sbox[16][16] = {
    {0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e,
     0x81, 0xf3, 0xd7, 0xfb},
    {0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44,
     0xc4, 0xde, 0xe9, 0xcb},
    {0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b,
     0x42, 0xfa, 0xc3, 0x4e},
    {0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49,
     0x6d, 0x8b, 0xd1, 0x25},
    {0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc,
     0x5d, 0x65, 0xb6, 0x92},
    {0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57,
     0xa7, 0x8d, 0x9d, 0x84},
    {0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05,
     0xb8, 0xb3, 0x45, 0x06},
    {0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03,
     0x01, 0x13, 0x8a, 0x6b},
    {0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce,
     0xf0, 0xb4, 0xe6, 0x73},
    {0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8,
     0x1c, 0x75, 0xdf, 0x6e},
    {0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e,
     0xaa, 0x18, 0xbe, 0x1b},
    {0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe,
     0x78, 0xcd, 0x5a, 0xf4},
    {0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59,
     0x27, 0x80, 0xec, 0x5f},
    {0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f,
     0x93, 0xc9, 0x9c, 0xef},
    {0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c,
     0x83, 0x53, 0x99, 0x61},
    {0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63,
     0x55, 0x21, 0x0c, 0x7d}};

/// Galois Multiplication lookup tables
static const unsigned char GF_MUL_TABLE[15][256] = {
    {},
    {},

    // mul 2
    {0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16,
     0x18, 0x1a, 0x1c, 0x1e, 0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e,
     0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, 0x40, 0x42, 0x44, 0x46,
     0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e,
     0x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76,
     0x78, 0x7a, 0x7c, 0x7e, 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e,
     0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, 0xa0, 0xa2, 0xa4, 0xa6,
     0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe,
     0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6,
     0xd8, 0xda, 0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee,
     0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, 0x1b, 0x19, 0x1f, 0x1d,
     0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05,
     0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d,
     0x23, 0x21, 0x27, 0x25, 0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55,
     0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, 0x7b, 0x79, 0x7f, 0x7d,
     0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65,
     0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d,
     0x83, 0x81, 0x87, 0x85, 0xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5,
     0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5, 0xdb, 0xd9, 0xdf, 0xdd,
     0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5,
     0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed,
     0xe3, 0xe1, 0xe7, 0xe5},

    // mul 3
    {0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d,
     0x14, 0x17, 0x12, 0x11, 0x30, 0x33, 0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39,
     0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21, 0x60, 0x63, 0x66, 0x65,
     0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71,
     0x50, 0x53, 0x56, 0x55, 0x5c, 0x5f, 0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d,
     0x44, 0x47, 0x42, 0x41, 0xc0, 0xc3, 0xc6, 0xc5, 0xcc, 0xcf, 0xca, 0xc9,
     0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1, 0xf0, 0xf3, 0xf6, 0xf5,
     0xfc, 0xff, 0xfa, 0xf9, 0xe8, 0xeb, 0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1,
     0xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, 0xb8, 0xbb, 0xbe, 0xbd,
     0xb4, 0xb7, 0xb2, 0xb1, 0x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99,
     0x88, 0x8b, 0x8e, 0x8d, 0x84, 0x87, 0x82, 0x81, 0x9b, 0x98, 0x9d, 0x9e,
     0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, 0x8f, 0x8c, 0x89, 0x8a,
     0xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6,
     0xbf, 0xbc, 0xb9, 0xba, 0xfb, 0xf8, 0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2,
     0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea, 0xcb, 0xc8, 0xcd, 0xce,
     0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda,
     0x5b, 0x58, 0x5d, 0x5e, 0x57, 0x54, 0x51, 0x52, 0x43, 0x40, 0x45, 0x46,
     0x4f, 0x4c, 0x49, 0x4a, 0x6b, 0x68, 0x6d, 0x6e, 0x67, 0x64, 0x61, 0x62,
     0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a, 0x3b, 0x38, 0x3d, 0x3e,
     0x37, 0x34, 0x31, 0x32, 0x23, 0x20, 0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a,
     0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, 0x13, 0x10, 0x15, 0x16,
     0x1f, 0x1c, 0x19, 0x1a},

    {},
    {},
    {},
    {},
    {},

    // mul 9
    {0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, 0x48, 0x41, 0x5a, 0x53,
     0x6c, 0x65, 0x7e, 0x77, 0x90, 0x99, 0x82, 0x8b, 0xb4, 0xbd, 0xa6, 0xaf,
     0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5, 0xee, 0xe7, 0x3b, 0x32, 0x29, 0x20,
     0x1f, 0x16, 0x0d, 0x04, 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
     0xab, 0xa2, 0xb9, 0xb0, 0x8f, 0x86, 0x9d, 0x94, 0xe3, 0xea, 0xf1, 0xf8,
     0xc7, 0xce, 0xd5, 0xdc, 0x76, 0x7f, 0x64, 0x6d, 0x52, 0x5b, 0x40, 0x49,
     0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01, 0xe6, 0xef, 0xf4, 0xfd,
     0xc2, 0xcb, 0xd0, 0xd9, 0xae, 0xa7, 0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91,
     0x4d, 0x44, 0x5f, 0x56, 0x69, 0x60, 0x7b, 0x72, 0x05, 0x0c, 0x17, 0x1e,
     0x21, 0x28, 0x33, 0x3a, 0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2,
     0x95, 0x9c, 0x87, 0x8e, 0xb1, 0xb8, 0xa3, 0xaa, 0xec, 0xe5, 0xfe, 0xf7,
     0xc8, 0xc1, 0xda, 0xd3, 0xa4, 0xad, 0xb6, 0xbf, 0x80, 0x89, 0x92, 0x9b,
     0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51, 0x4a, 0x43, 0x34, 0x3d, 0x26, 0x2f,
     0x10, 0x19, 0x02, 0x0b, 0xd7, 0xde, 0xc5, 0xcc, 0xf3, 0xfa, 0xe1, 0xe8,
     0x9f, 0x96, 0x8d, 0x84, 0xbb, 0xb2, 0xa9, 0xa0, 0x47, 0x4e, 0x55, 0x5c,
     0x63, 0x6a, 0x71, 0x78, 0x0f, 0x06, 0x1d, 0x14, 0x2b, 0x22, 0x39, 0x30,
     0x9a, 0x93, 0x88, 0x81, 0xbe, 0xb7, 0xac, 0xa5, 0xd2, 0xdb, 0xc0, 0xc9,
     0xf6, 0xff, 0xe4, 0xed, 0x0a, 0x03, 0x18, 0x11, 0x2e, 0x27, 0x3c, 0x35,
     0x42, 0x4b, 0x50, 0x59, 0x66, 0x6f, 0x74, 0x7d, 0xa1, 0xa8, 0xb3, 0xba,
     0x85, 0x8c, 0x97, 0x9e, 0xe9, 0xe0, 0xfb, 0xf2, 0xcd, 0xc4, 0xdf, 0xd6,
     0x31, 0x38, 0x23, 0x2a, 0x15, 0x1c, 0x07, 0x0e, 0x79, 0x70, 0x6b, 0x62,
     0x5d, 0x54, 0x4f, 0x46},

    {},

    // mul 11
    {0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31, 0x58, 0x53, 0x4e, 0x45,
     0x74, 0x7f, 0x62, 0x69, 0xb0, 0xbb, 0xa6, 0xad, 0x9c, 0x97, 0x8a, 0x81,
     0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf, 0xd2, 0xd9, 0x7b, 0x70, 0x6d, 0x66,
     0x57, 0x5c, 0x41, 0x4a, 0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12,
     0xcb, 0xc0, 0xdd, 0xd6, 0xe7, 0xec, 0xf1, 0xfa, 0x93, 0x98, 0x85, 0x8e,
     0xbf, 0xb4, 0xa9, 0xa2, 0xf6, 0xfd, 0xe0, 0xeb, 0xda, 0xd1, 0xcc, 0xc7,
     0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f, 0x46, 0x4d, 0x50, 0x5b,
     0x6a, 0x61, 0x7c, 0x77, 0x1e, 0x15, 0x08, 0x03, 0x32, 0x39, 0x24, 0x2f,
     0x8d, 0x86, 0x9b, 0x90, 0xa1, 0xaa, 0xb7, 0xbc, 0xd5, 0xde, 0xc3, 0xc8,
     0xf9, 0xf2, 0xef, 0xe4, 0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c,
     0x65, 0x6e, 0x73, 0x78, 0x49, 0x42, 0x5f, 0x54, 0xf7, 0xfc, 0xe1, 0xea,
     0xdb, 0xd0, 0xcd, 0xc6, 0xaf, 0xa4, 0xb9, 0xb2, 0x83, 0x88, 0x95, 0x9e,
     0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60, 0x7d, 0x76, 0x1f, 0x14, 0x09, 0x02,
     0x33, 0x38, 0x25, 0x2e, 0x8c, 0x87, 0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd,
     0xd4, 0xdf, 0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5, 0x3c, 0x37, 0x2a, 0x21,
     0x10, 0x1b, 0x06, 0x0d, 0x64, 0x6f, 0x72, 0x79, 0x48, 0x43, 0x5e, 0x55,
     0x01, 0x0a, 0x17, 0x1c, 0x2d, 0x26, 0x3b, 0x30, 0x59, 0x52, 0x4f, 0x44,
     0x75, 0x7e, 0x63, 0x68, 0xb1, 0xba, 0xa7, 0xac, 0x9d, 0x96, 0x8b, 0x80,
     0xe9, 0xe2, 0xff, 0xf4, 0xc5, 0xce, 0xd3, 0xd8, 0x7a, 0x71, 0x6c, 0x67,
     0x56, 0x5d, 0x40, 0x4b, 0x22, 0x29, 0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13,
     0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb, 0x92, 0x99, 0x84, 0x8f,
     0xbe, 0xb5, 0xa8, 0xa3},

    {},

    // mul 13
    {0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23, 0x68, 0x65, 0x72, 0x7f,
     0x5c, 0x51, 0x46, 0x4b, 0xd0, 0xdd, 0xca, 0xc7, 0xe4, 0xe9, 0xfe, 0xf3,
     0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81, 0x96, 0x9b, 0xbb, 0xb6, 0xa1, 0xac,
     0x8f, 0x82, 0x95, 0x98, 0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0,
     0x6b, 0x66, 0x71, 0x7c, 0x5f, 0x52, 0x45, 0x48, 0x03, 0x0e, 0x19, 0x14,
     0x37, 0x3a, 0x2d, 0x20, 0x6d, 0x60, 0x77, 0x7a, 0x59, 0x54, 0x43, 0x4e,
     0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26, 0xbd, 0xb0, 0xa7, 0xaa,
     0x89, 0x84, 0x93, 0x9e, 0xd5, 0xd8, 0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6,
     0xd6, 0xdb, 0xcc, 0xc1, 0xe2, 0xef, 0xf8, 0xf5, 0xbe, 0xb3, 0xa4, 0xa9,
     0x8a, 0x87, 0x90, 0x9d, 0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25,
     0x6e, 0x63, 0x74, 0x79, 0x5a, 0x57, 0x40, 0x4d, 0xda, 0xd7, 0xc0, 0xcd,
     0xee, 0xe3, 0xf4, 0xf9, 0xb2, 0xbf, 0xa8, 0xa5, 0x86, 0x8b, 0x9c, 0x91,
     0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33, 0x24, 0x29, 0x62, 0x6f, 0x78, 0x75,
     0x56, 0x5b, 0x4c, 0x41, 0x61, 0x6c, 0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42,
     0x09, 0x04, 0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a, 0xb1, 0xbc, 0xab, 0xa6,
     0x85, 0x88, 0x9f, 0x92, 0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0, 0xf7, 0xfa,
     0xb7, 0xba, 0xad, 0xa0, 0x83, 0x8e, 0x99, 0x94, 0xdf, 0xd2, 0xc5, 0xc8,
     0xeb, 0xe6, 0xf1, 0xfc, 0x67, 0x6a, 0x7d, 0x70, 0x53, 0x5e, 0x49, 0x44,
     0x0f, 0x02, 0x15, 0x18, 0x3b, 0x36, 0x21, 0x2c, 0x0c, 0x01, 0x16, 0x1b,
     0x38, 0x35, 0x22, 0x2f, 0x64, 0x69, 0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47,
     0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff, 0xb4, 0xb9, 0xae, 0xa3,
     0x80, 0x8d, 0x9a, 0x97},

    // mul 14
    {0x00, 0x0e, 0x1c, 0x12, 0x38, 0x36, 0x24, 0x2a, 0x70, 0x7e, 0x6c, 0x62,
     0x48, 0x46, 0x54, 0x5a, 0xe0, 0xee, 0xfc, 0xf2, 0xd8, 0xd6, 0xc4, 0xca,
     0x90, 0x9e, 0x8c, 0x82, 0xa8, 0xa6, 0xb4, 0xba, 0xdb, 0xd5, 0xc7, 0xc9,
     0xe3, 0xed, 0xff, 0xf1, 0xab, 0xa5, 0xb7, 0xb9, 0x93, 0x9d, 0x8f, 0x81,
     0x3b, 0x35, 0x27, 0x29, 0x03, 0x0d, 0x1f, 0x11, 0x4b, 0x45, 0x57, 0x59,
     0x73, 0x7d, 0x6f, 0x61, 0xad, 0xa3, 0xb1, 0xbf, 0x95, 0x9b, 0x89, 0x87,
     0xdd, 0xd3, 0xc1, 0xcf, 0xe5, 0xeb, 0xf9, 0xf7, 0x4d, 0x43, 0x51, 0x5f,
     0x75, 0x7b, 0x69, 0x67, 0x3d, 0x33, 0x21, 0x2f, 0x05, 0x0b, 0x19, 0x17,
     0x76, 0x78, 0x6a, 0x64, 0x4e, 0x40, 0x52, 0x5c, 0x06, 0x08, 0x1a, 0x14,
     0x3e, 0x30, 0x22, 0x2c, 0x96, 0x98, 0x8a, 0x84, 0xae, 0xa0, 0xb2, 0xbc,
     0xe6, 0xe8, 0xfa, 0xf4, 0xde, 0xd0, 0xc2, 0xcc, 0x41, 0x4f, 0x5d, 0x53,
     0x79, 0x77, 0x65, 0x6b, 0x31, 0x3f, 0x2d, 0x23, 0x09, 0x07, 0x15, 0x1b,
     0xa1, 0xaf, 0xbd, 0xb3, 0x99, 0x97, 0x85, 0x8b, 0xd1, 0xdf, 0xcd, 0xc3,
     0xe9, 0xe7, 0xf5, 0xfb, 0x9a, 0x94, 0x86, 0x88, 0xa2, 0xac, 0xbe, 0xb0,
     0xea, 0xe4, 0xf6, 0xf8, 0xd2, 0xdc, 0xce, 0xc0, 0x7a, 0x74, 0x66, 0x68,
     0x42, 0x4c, 0x5e, 0x50, 0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c, 0x2e, 0x20,
     0xec, 0xe2, 0xf0, 0xfe, 0xd4, 0xda, 0xc8, 0xc6, 0x9c, 0x92, 0x80, 0x8e,
     0xa4, 0xaa, 0xb8, 0xb6, 0x0c, 0x02, 0x10, 0x1e, 0x34, 0x3a, 0x28, 0x26,
     0x7c, 0x72, 0x60, 0x6e, 0x44, 0x4a, 0x58, 0x56, 0x37, 0x39, 0x2b, 0x25,
     0x0f, 0x01, 0x13, 0x1d, 0x47, 0x49, 0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d,
     0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd, 0xa7, 0xa9, 0xbb, 0xb5,
     0x9f, 0x91, 0x83, 0x8d}};

/// circulant MDS matrix
static const unsigned char CMDS[4][4] = {
    {2, 3, 1, 1}, {1, 2, 3, 1}, {1, 1, 2, 3}, {3, 1, 1, 2}};

/// Inverse circulant MDS matrix
static const unsigned char INV_CMDS[4][4] = {
    {14, 11, 13, 9}, {9, 14, 11, 13}, {13, 9, 14, 11}, {11, 13, 9, 14}};

AES::AES(const AESKeyLength keyLength) {
  switch (keyLength) {
    case AESKeyLength::AES_128:
      this->Nk = 4;
      this->Nr = 10;
      break;
    case AESKeyLength::AES_192:
      this->Nk = 6;
      this->Nr = 12;
      break;
    case AESKeyLength::AES_256:
      this->Nk = 8;
      this->Nr = 14;
      break;
  }
}

unsigned char *AES::EncryptECB(const unsigned char in[], unsigned int inLen,
                               const unsigned char key[]) {
  CheckLength(inLen);
  unsigned char *out = new unsigned char[inLen];
  unsigned char *roundKeys = new unsigned char[4 * Nb * (Nr + 1)];
  KeyExpansion(key, roundKeys);
  for (unsigned int i = 0; i < inLen; i += blockBytesLen) {
    EncryptBlock(in + i, out + i, roundKeys);
  }

  delete[] roundKeys;

  return out;
}

unsigned char *AES::DecryptECB(const unsigned char in[], unsigned int inLen,
                               const unsigned char key[]) {
  CheckLength(inLen);
  unsigned char *out = new unsigned char[inLen];
  unsigned char *roundKeys = new unsigned char[4 * Nb * (Nr + 1)];
  KeyExpansion(key, roundKeys);
  for (unsigned int i = 0; i < inLen; i += blockBytesLen) {
    DecryptBlock(in + i, out + i, roundKeys);
  }

  delete[] roundKeys;

  return out;
}

unsigned char *AES::EncryptCBC(const unsigned char in[], unsigned int inLen,
                               const unsigned char key[],
                               const unsigned char *iv) {
  CheckLength(inLen);
  unsigned char *out = new unsigned char[inLen];
  unsigned char block[blockBytesLen];
  unsigned char *roundKeys = new unsigned char[4 * Nb * (Nr + 1)];
  KeyExpansion(key, roundKeys);
  memcpy(block, iv, blockBytesLen);
  for (unsigned int i = 0; i < inLen; i += blockBytesLen) {
    XorBlocks(block, in + i, block, blockBytesLen);
    EncryptBlock(block, out + i, roundKeys);
    memcpy(block, out + i, blockBytesLen);
  }

  delete[] roundKeys;

  return out;
}

unsigned char *AES::DecryptCBC(const unsigned char in[], unsigned int inLen,
                               const unsigned char key[],
                               const unsigned char *iv) {
  CheckLength(inLen);
  unsigned char *out = new unsigned char[inLen];
  unsigned char block[blockBytesLen];
  unsigned char *roundKeys = new unsigned char[4 * Nb * (Nr + 1)];
  KeyExpansion(key, roundKeys);
  memcpy(block, iv, blockBytesLen);
  for (unsigned int i = 0; i < inLen; i += blockBytesLen) {
    DecryptBlock(in + i, out + i, roundKeys);
    XorBlocks(block, out + i, out + i, blockBytesLen);
    memcpy(block, in + i, blockBytesLen);
  }

  delete[] roundKeys;

  return out;
}

unsigned char *AES::EncryptCFB(const unsigned char in[], unsigned int inLen,
                               const unsigned char key[],
                               const unsigned char *iv) {
  CheckLength(inLen);
  unsigned char *out = new unsigned char[inLen];
  unsigned char block[blockBytesLen];
  unsigned char encryptedBlock[blockBytesLen];
  unsigned char *roundKeys = new unsigned char[4 * Nb * (Nr + 1)];
  KeyExpansion(key, roundKeys);
  memcpy(block, iv, blockBytesLen);
  for (unsigned int i = 0; i < inLen; i += blockBytesLen) {
    EncryptBlock(block, encryptedBlock, roundKeys);
    XorBlocks(in + i, encryptedBlock, out + i, blockBytesLen);
    memcpy(block, out + i, blockBytesLen);
  }

  delete[] roundKeys;

  return out;
}

unsigned char *AES::DecryptCFB(const unsigned char in[], unsigned int inLen,
                               const unsigned char key[],
                               const unsigned char *iv) {
  CheckLength(inLen);
  unsigned char *out = new unsigned char[inLen];
  unsigned char block[blockBytesLen];
  unsigned char encryptedBlock[blockBytesLen];
  unsigned char *roundKeys = new unsigned char[4 * Nb * (Nr + 1)];
  KeyExpansion(key, roundKeys);
  memcpy(block, iv, blockBytesLen);
  for (unsigned int i = 0; i < inLen; i += blockBytesLen) {
    EncryptBlock(block, encryptedBlock, roundKeys);
    XorBlocks(in + i, encryptedBlock, out + i, blockBytesLen);
    memcpy(block, in + i, blockBytesLen);
  }

  delete[] roundKeys;

  return out;
}

void AES::CheckLength(unsigned int len) {
  if (len % blockBytesLen != 0) {
    throw std::length_error("Plaintext length must be divisible by " +
                            std::to_string(blockBytesLen));
  }
}

void AES::EncryptBlock(const unsigned char in[], unsigned char out[],
                       unsigned char *roundKeys) {
  unsigned char state[4][Nb];
  unsigned int i, j, round;

  for (i = 0; i < 4; i++) {
    for (j = 0; j < Nb; j++) {
      state[i][j] = in[i + 4 * j];
    }
  }

  AddRoundKey(state, roundKeys);

  for (round = 1; round <= Nr - 1; round++) {
    SubBytes(state);
    ShiftRows(state);
    MixColumns(state);
    AddRoundKey(state, roundKeys + round * 4 * Nb);
  }

  SubBytes(state);
  ShiftRows(state);
  AddRoundKey(state, roundKeys + Nr * 4 * Nb);

  for (i = 0; i < 4; i++) {
    for (j = 0; j < Nb; j++) {
      out[i + 4 * j] = state[i][j];
    }
  }
}

void AES::DecryptBlock(const unsigned char in[], unsigned char out[],
                       unsigned char *roundKeys) {
  unsigned char state[4][Nb];
  unsigned int i, j, round;

  for (i = 0; i < 4; i++) {
    for (j = 0; j < Nb; j++) {
      state[i][j] = in[i + 4 * j];
    }
  }

  AddRoundKey(state, roundKeys + Nr * 4 * Nb);

  for (round = Nr - 1; round >= 1; round--) {
    InvSubBytes(state);
    InvShiftRows(state);
    AddRoundKey(state, roundKeys + round * 4 * Nb);
    InvMixColumns(state);
  }

  InvSubBytes(state);
  InvShiftRows(state);
  AddRoundKey(state, roundKeys);

  for (i = 0; i < 4; i++) {
    for (j = 0; j < Nb; j++) {
      out[i + 4 * j] = state[i][j];
    }
  }
}

void AES::SubBytes(unsigned char state[4][Nb]) {
  unsigned int i, j;
  unsigned char t;
  for (i = 0; i < 4; i++) {
    for (j = 0; j < Nb; j++) {
      t = state[i][j];
      state[i][j] = sbox[t / 16][t % 16];
    }
  }
}

void AES::ShiftRow(unsigned char state[4][Nb], unsigned int i,
                   unsigned int n)  // shift row i on n positions
{
  unsigned char tmp[Nb];
  for (unsigned int j = 0; j < Nb; j++) {
    tmp[j] = state[i][(j + n) % Nb];
  }
  memcpy(state[i], tmp, Nb * sizeof(unsigned char));
}

void AES::ShiftRows(unsigned char state[4][Nb]) {
  ShiftRow(state, 1, 1);
  ShiftRow(state, 2, 2);
  ShiftRow(state, 3, 3);
}

unsigned char AES::xtime(unsigned char b)  // multiply on x
{
  return (b << 1) ^ (((b >> 7) & 1) * 0x1b);
}

void AES::MixColumns(unsigned char state[4][Nb]) {
  unsigned char temp_state[4][Nb];

  for (size_t i = 0; i < 4; ++i) {
    memset(temp_state[i], 0, 4);
  }

  for (size_t i = 0; i < 4; ++i) {
    for (size_t k = 0; k < 4; ++k) {
      for (size_t j = 0; j < 4; ++j) {
        if (CMDS[i][k] == 1)
          temp_state[i][j] ^= state[k][j];
        else
          temp_state[i][j] ^= GF_MUL_TABLE[CMDS[i][k]][state[k][j]];
      }
    }
  }

  for (size_t i = 0; i < 4; ++i) {
    memcpy(state[i], temp_state[i], 4);
  }
}

void AES::AddRoundKey(unsigned char state[4][Nb], unsigned char *key) {
  unsigned int i, j;
  for (i = 0; i < 4; i++) {
    for (j = 0; j < Nb; j++) {
      state[i][j] = state[i][j] ^ key[i + 4 * j];
    }
  }
}

void AES::SubWord(unsigned char *a) {
  int i;
  for (i = 0; i < 4; i++) {
    a[i] = sbox[a[i] / 16][a[i] % 16];
  }
}

void AES::RotWord(unsigned char *a) {
  unsigned char c = a[0];
  a[0] = a[1];
  a[1] = a[2];
  a[2] = a[3];
  a[3] = c;
}

void AES::XorWords(unsigned char *a, unsigned char *b, unsigned char *c) {
  int i;
  for (i = 0; i < 4; i++) {
    c[i] = a[i] ^ b[i];
  }
}

void AES::Rcon(unsigned char *a, unsigned int n) {
  unsigned int i;
  unsigned char c = 1;
  for (i = 0; i < n - 1; i++) {
    c = xtime(c);
  }

  a[0] = c;
  a[1] = a[2] = a[3] = 0;
}

void AES::KeyExpansion(const unsigned char key[], unsigned char w[]) {
  unsigned char temp[4];
  unsigned char rcon[4];

  unsigned int i = 0;
  while (i < 4 * Nk) {
    w[i] = key[i];
    i++;
  }

  i = 4 * Nk;
  while (i < 4 * Nb * (Nr + 1)) {
    temp[0] = w[i - 4 + 0];
    temp[1] = w[i - 4 + 1];
    temp[2] = w[i - 4 + 2];
    temp[3] = w[i - 4 + 3];

    if (i / 4 % Nk == 0) {
      RotWord(temp);
      SubWord(temp);
      Rcon(rcon, i / (Nk * 4));
      XorWords(temp, rcon, temp);
    } else if (Nk > 6 && i / 4 % Nk == 4) {
      SubWord(temp);
    }

    w[i + 0] = w[i - 4 * Nk] ^ temp[0];
    w[i + 1] = w[i + 1 - 4 * Nk] ^ temp[1];
    w[i + 2] = w[i + 2 - 4 * Nk] ^ temp[2];
    w[i + 3] = w[i + 3 - 4 * Nk] ^ temp[3];
    i += 4;
  }
}

void AES::InvSubBytes(unsigned char state[4][Nb]) {
  unsigned int i, j;
  unsigned char t;
  for (i = 0; i < 4; i++) {
    for (j = 0; j < Nb; j++) {
      t = state[i][j];
      state[i][j] = inv_sbox[t / 16][t % 16];
    }
  }
}

void AES::InvMixColumns(unsigned char state[4][Nb]) {
  unsigned char temp_state[4][Nb];

  for (size_t i = 0; i < 4; ++i) {
    memset(temp_state[i], 0, 4);
  }

  for (size_t i = 0; i < 4; ++i) {
    for (size_t k = 0; k < 4; ++k) {
      for (size_t j = 0; j < 4; ++j) {
        temp_state[i][j] ^= GF_MUL_TABLE[INV_CMDS[i][k]][state[k][j]];
      }
    }
  }

  for (size_t i = 0; i < 4; ++i) {
    memcpy(state[i], temp_state[i], 4);
  }
}

void AES::InvShiftRows(unsigned char state[4][Nb]) {
  ShiftRow(state, 1, Nb - 1);
  ShiftRow(state, 2, Nb - 2);
  ShiftRow(state, 3, Nb - 3);
}

void AES::XorBlocks(const unsigned char *a, const unsigned char *b,
                    unsigned char *c, unsigned int len) {
  for (unsigned int i = 0; i < len; i++) {
    c[i] = a[i] ^ b[i];
  }
}

void AES::printHexArray(unsigned char a[], unsigned int n) {
  for (unsigned int i = 0; i < n; i++) {
    printf("%02x ", a[i]);
  }
}

void AES::printHexVector(std::vector<unsigned char> a) {
  for (unsigned int i = 0; i < a.size(); i++) {
    printf("%02x ", a[i]);
  }
}

std::vector<unsigned char> AES::ArrayToVector(unsigned char *a,
                                              unsigned int len) {
  std::vector<unsigned char> v(a, a + len * sizeof(unsigned char));
  return v;
}

unsigned char *AES::VectorToArray(std::vector<unsigned char> &a) {
  return a.data();
}

std::vector<unsigned char> AES::EncryptECB(std::vector<unsigned char> in,
                                           std::vector<unsigned char> key) {
  unsigned char *out = EncryptECB(VectorToArray(in), (unsigned int)in.size(),
                                  VectorToArray(key));
  std::vector<unsigned char> v = ArrayToVector(out, in.size());
  delete[] out;
  return v;
}

std::vector<unsigned char> AES::DecryptECB(std::vector<unsigned char> in,
                                           std::vector<unsigned char> key) {
  unsigned char *out = DecryptECB(VectorToArray(in), (unsigned int)in.size(),
                                  VectorToArray(key));
  std::vector<unsigned char> v = ArrayToVector(out, (unsigned int)in.size());
  delete[] out;
  return v;
}

std::vector<unsigned char> AES::EncryptCBC(std::vector<unsigned char> in,
                                           std::vector<unsigned char> key,
                                           std::vector<unsigned char> iv) {
  unsigned char *out = EncryptCBC(VectorToArray(in), (unsigned int)in.size(),
                                  VectorToArray(key), VectorToArray(iv));
  std::vector<unsigned char> v = ArrayToVector(out, in.size());
  delete[] out;
  return v;
}

std::vector<unsigned char> AES::DecryptCBC(std::vector<unsigned char> in,
                                           std::vector<unsigned char> key,
                                           std::vector<unsigned char> iv) {
  unsigned char *out = DecryptCBC(VectorToArray(in), (unsigned int)in.size(),
                                  VectorToArray(key), VectorToArray(iv));
  std::vector<unsigned char> v = ArrayToVector(out, (unsigned int)in.size());
  delete[] out;
  return v;
}

std::vector<unsigned char> AES::EncryptCFB(std::vector<unsigned char> in,
                                           std::vector<unsigned char> key,
                                           std::vector<unsigned char> iv) {
  unsigned char *out = EncryptCFB(VectorToArray(in), (unsigned int)in.size(),
                                  VectorToArray(key), VectorToArray(iv));
  std::vector<unsigned char> v = ArrayToVector(out, in.size());
  delete[] out;
  return v;
}

std::vector<unsigned char> AES::DecryptCFB(std::vector<unsigned char> in,
                                           std::vector<unsigned char> key,
                                           std::vector<unsigned char> iv) {
  unsigned char *out = DecryptCFB(VectorToArray(in), (unsigned int)in.size(),
                                  VectorToArray(key), VectorToArray(iv));
  std::vector<unsigned char> v = ArrayToVector(out, (unsigned int)in.size());
  delete[] out;
  return v;
}
